Two trains having lengths of 300 m and 200 m are running at speeds of 70 km/h and 120 km/h, respectively, in the same direction. The time taken (in minutes) by the faster train, coming from behind, to completely cross the other train is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 0.6.
Relative speed (same direction) = 120 – 70 = 50 km/h
Convert to m/s: 50 × (1000/3600) = 13.89 m/s
Total length to cross = 300 + 200 = 500 m
Time = 500 / 13.89 ≈ 36 seconds
Convert to minutes: 36 ÷ 60 = 0.6 minutes